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OPERATING INSTRUCTIONS
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7.3.4
Neutralization
Some Cleaning liquids require neutralization prior to disposal. (Refer Cleaning liquids
procedures)
If the cleaning liquid is to be re-used do not neutralize it.
The neutralization process is done by adding the neutralization liquid to the cleaning
liquid in accordance with the separate instruction for neutralization liquids.
Stop pump and heater before adding the neutralization liquid. Turn the valves to
position according to below description.
Turn the valves to position according to below description. Assemble the hoses
according to P&I diagram. S03 must be connected to HE lower port and S02 must be
connected to HE upper port.
Valve tag
number
Status
V01
Close
V02
Open
V03
Open
V04
Close
V05
Open
V07 (tank)
Open
V08
Closed
V11
Closed
Start the pump.
The circulation of the fluid is maintained until the “used” cleaning liquid has obtained
a pH value of 6.5 to 7.5. The neutralization process may take about 1 hour to
complete.
CIP equipment must never be left unattended. In case of unexpected pump stop, like
for example power failure, valves V03, V04 and V08 must be closed to avoid uncontrolled
backflow from the heat exchanger and valves V05, V02 and V12 should be opened to
allow ventilation to the top of the heat exchanger to avoid pressure build up. This is
especially important when a CIP 400L is in operation since a power failure and free
draining to a single tank causes a major risk of overflow.
